I used crapp bondo on my back decks and it looked terrible and did not last . It fell out of knots and splits . It does not expand like water wood putty . I have used this wood putty for a long time . But for awhile after moving here from NJ I could not get it here . It expands and contrats with the wood . It is cheaper and great indoors and outdoors . I buy 4 pound container for under 12 dollars after taxes . It is pwder so goes a long way , but when you mix it you have t do it in small amounts because it dries fast and hard